Easily water soluble salts of wool dyestuffs



Patented Aug. 26,- 1941 EASIL? WATER SOLUBLE SALTS F WOOL D'YESTUFFS Samuel von Allmen and Edmond Rosselet, Basel,

Switzerland, assignors to Sandoa Ltd- Basel,

Switzerland No Drawing. Application April 21, 1939, Serial. No. 269,260. In Switzerland April 29, 1938.

4 Qlaims. (c1. ago-ear v "-lhe following table shows the diiierence in the solubility of the new salts as compared to the corresponding sodium salts usually employed.

The present invention relates to the production of easily water soluble salts of acid wool dyestuffs that contain an anthraquinone nucleus.

It is well known that among the sulphonated dyestufis derived from the anthraguinone, some of them possess an insufiicient solubility in water and present therefore various diificulties, when they are used in the dyeingv and printing.

It has now been found that the solubility of such dyestufis can be greatly increased by transforming them into lithium salts, which, as it has been ascertained, possess a much better solubility in water than the sodium salts generally used for thispurpose.

The dyestufis which are especially suitable for carrying out the present invention respond to the following general formula Y i Y SOsE wherein X stands for a hydroxy, amino, alkylamino and sulphonated arylamino group, Y stands for hydrogen and alkyl and Z stands for I hydrogen and halogen.

Also the dyestuffs possessing the following general formula SOaH wherein Y stands for hydrogen and alkyl, become more easily soluble in water when they are transformed into lithium salts.

The preparation of the lithium salts of the sulphonated wool dyestufis of the above constitution can be carried out by treating the free dyestufi acids with lithium hydroxide, chloride, sulphate, carbonate and the like in presence of water, or by double decomposition of suitable dyestufi salts, for example by treating the calcium or barium salts of the dyestuffs with lithium carbonate or sulphate.

The easily water-soluble lithium salts are then obtained in dry state by evaporation of the solution or in any other usual way.

5 I OOQ pepts of boiling water dis so1ye Dyestufi Sodium Lithium salt salt 19 i) OH I v v Parta Parts 1% t 5 SO35: 0 NHCH: 20 (U;

a? 12 as OgH (I? NH, O (I Br 4 20 b NH I CH: I

H! CH;

o NBS-@0154 I SOzH OH: 803 I NH CH: C

CH: l o N -Qcm 6H1 SOIH What We ciaim is: 3. The lithium salt of the dyestuif of the 1. The lithium salts of acid wool dyestuffs of formula:

h n t t e ge eral formula (M) NH:

n 5 c 0 Br Y Y, t I O O t v n u I I I 0 NH 0 NH I alkyl- 10 I j l I l V 4 303E Y'iY- SOaH wherein X stands for a, member of the group con- The lithium salt of the dyestuff of the sisting of hydroxy, amino, alkylamino, sulphon- 15 formula: ated aryl'amino, Z stands for a. member of the CH3 group consisting of hydrogen and halogen, and 303K Y stands for a member of the group consisting 0 NH -CH; of hydrogen and alkyl. 20 2. The lithium salt of the dyestufi of the on,

formula: I NHQHt' C 2 ("2 NH gz-cm 5 v 1 803E v I i v '0' 0 Q SAMUEL voNALL MEN.

S 7 EDMOND ROSSELET. 

